Bolt anchor



Nov. 29, 1927.

R. E. OGDEN ET AL BOLT ANCHOR Filed April 14, 1922 2 Sheets-Sheet 1 6. Arthur 7?. Van Tasse Nov. 29, 1927. I 1,650,956

R. E. OGDEN ET AL I BOLT ANCHOR Filed April 4, 1922 l 2 Sheets-Sheet 2 h l l I I roam,

'IIIII,

Filip/z E 09d 671. {inventor/J Charles C. Tam/mum, ArZ/zurfi. Van T'aJEZZ Patented Nov. 29, 1927.

This invention relates to improvements in' warren; si'rarnsf PATENT OFFICE.

RALPH EDWARD oennn'; on ooni iwirnnnnw Yo'nni onnn nns o'. roiviK'Inson; or

rnninr'initn; Ann Aswan s2 v-A'n rAssELL, or BAYONNE; NEW JERSEY, as srenons, BY ivrnsnn nssienivinnrs; To J. EDWARD OGDEN; or" MoUn'rAINvILLE; NEW YORK.

BOLT Ancnon.

Applicationfiled A'prl114i 1922. Serial No. 552,814.

bolt anchors of the character employed for obtaining anchorage in Walls of brick, stone and cementitious material not adapted to 5 directly receive a threaded member.

One of the objects'of the invention is to provide an expansion shield so constructed and arranged as to possess superior gripping qualities.

Another object or" the invention is to provide a shield and an expanding member for the shield so relativelyconstructed and ar-' ranged as to obtain gripping actions at a plurality of different points or areas throughout the length oftheshield.

Another object of the invention is to pro-' on its outer surface for effectinga secure gripping action when the shield is expanded.

Another object of the invention is to pro-' vide a. sheet metal expans o gh eld h i an excess of metal on its outer surface, this excess oi metal being obtained withoutre-' quiring the folding or b'endingoi the metal of the shield.

Further objects of the invention will appear from the following specifications taken in connection withthe drawings which' illustrate the invention and in which Figure 1 is an elevation of an expansion shield having an expanding element or'nut therein, these parts being constructed in accordance with the invention.

Fig-'2 is a longitudinalsectional elevation taken substantially on line 2-2 of Fig. 1.

Fig. 3 is an end elevation of the inner end of the shield and expanding-element shown in Fig. 1.

Fig. at is a transverse sectional elevation taken substantially on line 4+4 of F 1. 5 is a tYZtIlSVGlSB SECtlODLl elevation substantially on line 5-5 of Fig. 1: '56 is an elevation showing another form of the shield constructed in accordance withthe invention.

Fig. 7 is a transverse sectional elevation taken on line 77 of Fig. 6.

Fig. 8 is an elevational view partly broken being shown expanded in an opening or bore in a wall or otherstructure, and

Fig. 12 is a sectional elevation similar to Fig. 11 but showing the parts still further:

expanded.

The invention maybe briefly described as compris ng an expansion shield formed pref-' erably from a plurality of sheet metal stampings. inner end a plurality of'V-shaped notches, with fingers formed between them which are bent over at their extremities thereby, forming retaining means? for the expanding element or nut. The shield has formed therein an internal inwardly extending annular" shoulder and on the outer surface of the shield there is provided an excessof metal adjacent the portion of the shield having the internal shoulder. In certain forms or the invention'a plurality of these shoulders of different angularity is provided. Theexpanding element in the embodimentsof the invention shown consists of a nut having a substantiallyv square endand having its outer surfaces comprising a plurality of coaxial conical surfaces'of differentangula'rity. One of these surfaces is adapted to effect an initial expansion of the shield as the nut travels lengthwise of the shield and other conical surfaces are adapted to successively engage the internal shoulders which serve the double function of forming stops for the nut and of effecting in conjunction with The shield has'forme'd adjacent its' panding elements shown in Fig. 1, the anchor the conical surfaces further expansion of place the excess metal on the outer surface of the shield is forced into engagement with the wall of the bore in which the shield is positioned. Further details of the invention will be hereinafter described.

The expansion shield shown in 1 to 5,, inclusive, comprises a shell divided longitudinally throughout its length and comprising in the form of the invention illustrated a pair of sections 20 and 21. These sections are preferably formed of sheet metal stampings and as shown in Fig. 5 one of the sections 20 has formed thereon a pair of lugs or tabs 22 adapted to overlap the other section and to seat in an annular depres 'on 23 formed therein. These tabs bond the sections together and it should be understood that any other form of bondingmeans may be used if desired.

The shield has formed therein adjacent its inner end a plurality of inwardly extending V-shaped notches 24*, these notches forming tapered fingers 24. The ends of the fingers 24 as shown at 25 are bent inwardly toward the axis-of-the'shield and form retaining means for the expanding element or nut 26 when this member is positioned within the shield.

The expansion shield has formed therein in addition to the depression 23 an annular depression 27, this latter depression being disposed intermediate the ends of the shield and foriningan inclined internal shoulder 28.

In order to provide an excess of metal to facilitate the gripping action when the shield is expanded, we have illustrated in Figs. 1 and 4 a pair of tabs 29 and 30, the tab 29 being formed on the section 20' and the tab 30 being formed on the section 21. The tab 29 overlaps the section 21' and the tab 30 overlaps the section 20, but it should be noted that the tabs 29 and 30 do not perform any bonding function, this function being performed by the tabs 22 above described.

be expanding element or nut 26, as shown in Fig. 3, is substantially square at one end and has its outer surface formed into a plurality of conical surfaces 31 and 32. These conical surfaces are co-axial and from the showing in Fig. 2 it will be noted that the surface 32 is formed on a steeper incline than the surface 31. Although two conical surfaces have been shown in Fig. 2 and a single internal shoulder 28 has been illustrated, it will be understood that any desired number of these surfaces and shoulders may be used, and in another form of the invention hereinafter described a construction is shown in which three conical surfaces on the nut and two internal shoulders in the shield are employed. Y

The operation or manner of use of the construction shown in Figs. 1 to 5 will be outlined after the other modifications or forms of the invention have been described.

The construction shown in Figs. 6 and 7 is similar to that shown in Figs. 1 to 5' and differs therefrom only in the fact that instead of the overlapping tabs 29 and 30 the excess metal is provided by an annular split band or ring 33.

In Fig. 8 another form of the invention is illustrated and in this form an annular groove 34 is formed in the shield and a split ring 35 is seated in the groove and provides the. excess metal upon the expansion of the portion of the shield upon which the ring is positioned.

In Fig. 9 another form of the invention is shown and in this form the expansion shield has formed therein annular depressions 40, 41 and 42. Tabs 43 similar to the tabs 22 shown in Fig. 5 bond the sections together.

The depressions and 41 form internal shoulders at 44 and 45 of different angularity. The outer surface of the expanding element or nut 46 in this instance comprises a plurality of conical surfaces .47, 48 and 49, these surfaces being co-axial and inclined at different angles with reference to the axis of the nut. The angle ofinclination of the surfaces 48 and49 will be so worked llil out as to effectively co-act with the internal 1 shoulders at 44 and 45 in expanding the shield.

The excess of metal in the depression 40 is formed by tabs 50 similar to the tabs 29 and 30 shown in Fig. 4, and the excess of metal in the depression 41 is formed by an annular split ring or band 51 of smiicient thickness to bring the outside dimension thereof within the cylindricalsurface which forms the outer peripheral surface of the shield. It should be noted in this connection that in each embodiment the different parts of the shield and the outer surfaces of the members forming the excess metal all disposed substantially within one cylindrical surface. Y

In Fig. 10 still another form of the invention is shown and in this form the shield has an elongated depression (50 in which is positioned an elongated split sleeve or ring 61. The sleeve 61 performs both the bonding function and the function of providing excess metal on the outer surface of the shield.

Referring particularly to Figs. 11 and 12 the operation or method of using'the device will be described.

The shield nut and bolt are assembled 'and are their inerted in the opening in :70 is turned, with the parts positioned as shown, the nut 26 w1ll travel lengthwise on llil the bolt within the shield and its outersurface 31 will at first engage and expand the portion of the shield adjacent the inner end. If the shield and wall opening are so proportioned that such an initial expansion as that shown in Fig. 11 is suflicient to retain the shield within the opening, the nut may be advanced no further than the position shown in said figure. It has been found,

however, that the nut in this type of shield does not come to a fixed position but can usually be drawn further into theshield by the rotation of the bolt. The shoulder. 28, however, will provide a stop in case the nut has traveled outward to thelimit of its expansion. If, however, the limit of expansion has not then been. reached, a further rotation of the bolt will cause the conical surface 32 to co-act with the internal shoulder 28 and effect a further expansion of the parts as shown in Fig. 12. This further expansion will force the excess metal formed by the tabs 29 and 30 or by the split ring 33 or other parts illustrated in the drawings into gripping contact with the inner wall of the opening. This, as will readily be seen, forms a very rigid and firm anchorage.

In case the form of anchor shown in Fig. 9 is used, a third stage of expansion may be obtained by the co-act-ion of the conical surface 49 of the inclined shoulder at 4:5.

From the foregoing specification it will be evident that a simple, practical and effective bolt anchor construction has been developed and that the parts constructed as shown in the variousembodiments of the'invention will effectively perform the functions for which they were desi ned, namely, toobtain a. firm and secure anchorage.

Although certain specific embodiments of the invention have been particularly shown and described, 1t will be understood that the invention is capable of further modifi cation and that further changes inthe construction and in the arrangement of the various co-operat-ing parts. may be made WltAOUl} departing from the spirit or scope of the invention as expressed in the following claims.

v hat we claim is:

1. An expansion shield comprising a plurality of expansible elements having walls of uniform thickness, and an expanding member, said expansible elements and expanding member being so relatively. constructed and arranged that the expanding member will expand the expansible elements in a plurality of successive stages.

2. Anexpansion shield comprising a plurality of expansible elements-having walls. of uniform thickness, and an expandmg.

member, said expansible elements and expanding member having surfaces adapted to co-act in such a manner that the expanding member will expandthe expansible elements in a plurality of successive stages.

3. An expansion shield comprising a. plurality of expansible portions having walls of uniform thickness, and an expanding member adapted to travel lengthwise in said shield and having a plurality of surfaces adapted to successively engage and expand different portions of said shield.

4. An expansion shield comprising a plurality of expansible portions having walls of uniform thickness, and. an expanding menn ber adapted to travel lengthwise in said shield and having a plurality of surfaces disposed angularly with respect to-the normal surface of the shield adapted to succes sively engage and expand different portions of said shield.

5. An expansion shield comprising a plurality of expansible elements, and expandingv member, said expansible elements and expanding member being so relatively constructed and arranged that the expanding member will expand the expansible elements in a plurality of successive stages, and means providing an excess of metal on the outer surface of said shield,

6. An expansion shield comprising a plurality of expansible elements, an expanding member, said expansible elements and expanding member being so relatively constructed and arranged that the expanding member will expand the expansible elements in a plurality of successive stages, and means intermediate-the ends of the shield providing an excess of metal on the outer surface of said shield.

7. An expansion shield substantially cylindrical .at its inner: end comprising a plu rality of expansible sections, meanswithin said shield adapted to travel lengthwise thereof and expand said'sections, an annular depression intermediate the ends of the shield, and common means disposed in said depression for initially securing said sections together and providing an excess of metal at the expansible portions of said sections.

8. An expansion shield comprising plurality of expansible sections, single means within said shield adapted to travel lei'igthwise thereof and expand said'sections and means encircling the shield for initially securing said sections together and providing an excess of metal at the expansible portions of said sections.

9. An expansion shield comprising a plurality of expansible sections having walls of uniform thickness, a nut within said shield adapted to travel lengthwise thereof and. expand said sections, said nut and shield having a plurality of successively engage able portions whereby difierent portions of the shield will be expanded successively.

means on the outer surface of the shield in the indentation thereof forming an excess of metal thereon.

11. An expansion shield comprising a plurality of expansible sections, means for W- curing said sections together including means carried by each section and overlapping a portion of the other section pro-- viding an excess of metal on the outer sur face of the shield.

12. l n expansion shield coin;)risnnga plurality of expausible sections, means for securing said sect-ions together incl riding: a tab carried by each section and overlapping a portion of the other section providing an excess of metal on the outer sin-face of the shield.

13. In combination, an expansion shield having a plurality of expansible sections of uniform thickness, a nut adapted to travel lengthwise in the shield and having a Conical outer surface adapted to engage and expand one portion of the shield and having another conical outer surface adapted to engage and expand another portion of the shield.

14. In combination, an expansion shield havin a plurality of expansible sections of uniform thickness, a nut adapted to travel lengthwise in the shield and having a conical outer surface adapted to engage and expand one portion of the shield and having another co-axial conical outer surface inclined at a diilerent angle to its axis from the. other conical surface and adapted to. engage and expand another portion of the shield.

15. In combination, a sheet metal expan sion shield having a plurality of expansible sections of uniform thickness, a nut adapted to travel lengthwise in the shield and having an inclined outer surface adapted to engage and expand one portion of the shield and having another inclined outer surface apted to engage and expand another portion of the shield.

16. In combination, an expansion shield having a plurality of notches at its inner end and a nut having angular portions adapted to extend into said notches and having conical portions adapted-to successively engage difiierent portions of the shield 17. An expansion shield comprising a pair of expansilole sections, tabs on one member overlapping and engaging a depressed portion of the other member and an additional tab formed on each member overlapping and engaging a depressed portion in the other member for providing an excess of metal on the outer surface of the shield.

18. In combination, an expansion shield having inwardly turnedend portions for retaining a nut Within the shield and a nut Within the shield having a plurality of inclined portions adapted to successively engage longitudinally spaced portions of the shield. j

19. An expansion shield having longitudinally spaced annular depressions therein and expansible excess metal disposed in certain of said depressed portions intermediate the ends of the shield expansible into an anchorage engagement.

20. An expansion shield having longitudinally spaced annular depressions therein and an expansible annular band disposed in certain of said depressed portions intermediate the ends of the shield. providing excess metal at the outer surface of the shield expansible into an anchorage engagement.

A sectional expansion shield having longitudinally spaced annular depressions therein and expansible excess metal disposed in curtain of said depressed portions intermediate the ends of the shield, and means seated in other depressed portions for securing the sections of the shield together.

22. A sectional expansion shield having longitudinally spaced, annular depressions therein, means engaging and seated in a depression adjacent the outer end of the shield for securing the sections together and expansible means in a depression adjacent the central portion of the shield for providing an excess of metal expansible into an anchorage engagement. i

'23. A sectional expansion shield having longitudinally spaced, annular depressions. therein, means including tabs carried by one section and engaging the other section and seated in a depression adjacent the outer end of the shield for securing the sections together and means in a depression adjacent the central portion of the shield for pro viding an excess of metal.

24. A sectional expansion shield having longitudinally spaced, annular depressions therein, means including tabs carried by one section and engaging the other section and seated in a depression adjacent the outer end of the shield for securing the sections together and means including tabs formed on each section engaging the other. section in a depression adjacent the central portion of the shield for providing an excess of metal.

'25. In combination, a sheet metal expansion shield having plurality of inwardly extending internal shoulders and an expanding element having a plurality of surfaces adapted to successively coact with said shouldersto expand the shield.

26. In combination, an expansion shield of substantially uniform thickness throughout its length and having a plurality of inwardly extending internal shoulders of different ill) loo

successivelycoact with said shoulders 'to expand the shield.

27. An expansion shield comprising a plurality of sections, one of said sections having means for securing said section to the other section and the other section having means adapted to overlap the first section and pro-- vide excess metal on the outer surface of the shield.

28. In combination, an expansion shield having-a plurality of inwardly extending internal shoulders, an expanding element having a plurality of surfaces adapted to successively co-act with said shoulders to expand the'shield, and means carried by the 29 shield and disposed adjacent said shoulders providing excess metal on the outer surface of the shield.

29. In combination, an expansion shield having a plurality of inwardly extending internal shoulders, an expanding element hav ing a plurality of surfaces adapted to successively co-act with said shoulders to expand the shield and separate means overlying the outer surface of the shield and dis- 30 posed adjacent said shoulders for providing excess metal. 1

80. In combination, an expansion shield comprising a tube of sheet metal with expansible parts thereof depressed to constrict the bore and with a separate metallic member overlying and substantially filling the depression to thicken the wall of the tube and expanding means within the shield enga-geable with the expansible parts thereof expand the shield into permanent gripping engagement with the wall of an opening.

31. In combination, an expansion shield comprising a tube of sheet metal with expansible parts thereof depressed to constrict the bore and with a separate metallic member extending circumferentially of the tube and seated in and substantially filling the depression to thicken the wall of the tube and expanding means within the shield engageable with the expansible parts thereof to expand the shield into permanent gripping engagement with the wall of an opening.

32. In combination, an expansion shield comprising a tube of sheet metal with expansible parts thereof annularly depressed to constrict the bore and with a fiat ring seated in and substantially filling the depres sion to thicken the wall of the tube and expanding means within the shield engageable 33. An expansion shifild comprising a plurality of expansible sheet metal elements, together forming a tube, with similar expansible parts ofeach element depressed to form an annular constriction in the bore of the tube and with a separate metallic member overlying and substantially filling the depression to thicken the wall of the tube. V 34. A expansionshield'comp'rising'a plu rality of expansible sheet'metal elements, together forming a tube, with similar expansible parts of each element depressed to form an annular constriction in the bore of the tube and with a separate metallic member extendin circumferentially of the tube and seated in the depression to thicken the wall .of the tube.

gether forming a tube, with similar parts of each element depressed to form an annular constriction in the bore of the tube and with a fiat ring seated in the depression to thicken the wall of the tube.

36. An expansion shield comprising a tube of sheet metal with longitudinally spaced annular depressions of unlike depths and with metallic members of diiferent thicknesses seated in said depressions.

37. In combination, an expansion shield having a plurality of expansible sections provided with tapered fingers thereon, said shield having an inclined shoulder formed therein and a nut disposed within said shield and having flat portions engaged by said fingers and having tapered portions for expanding the shield sections, said nut having an inclined end surface adapted to engage the inclined shoulder within the shield whereby the movement of the nut in the shield is restricted.

38. An expansion shield formed of sheet metal having intermediate its ends a dry pressed portion constricting the bore of the shield and forming an internal beveled shoulder, a nut having a beveled end portion adapted to engage said internal shoulder and excess metal disposed in the depressed portion of the shield.

39. In combination, an expansion shield having a plurality of expansible sect-ions of uniform thickness, a nut adapted to travel lengthwise in the shield and having a conical outer surface adapted to engage and expand one portion of the shield and having another conical outer surface adapted to engage and expand another portion of the shield, said shieldhaving an inwardly extending shoulder disposed in the path of movement of one of the conical surfaces adapted to limit the movement of the nut 1n the shield.

40. An expansion shield having an expansible portion, a nut within said shield bearing upon the inner surface of the walls of said expunsible portion arranged to travel In Witness whereof, I have hereunto set 0v lengthwise therein to effect expansion, said my hand this 13th day of April, 1922; 7 Walls being bent inwardly to form a shoulder RALPH EDW'A'BD OGDEN; within the shield in the path of travel of In witness whereof, I have hereunto set the nut, the end of said nut being beveled my hand this 13th day of April, 1922.

to provide a sliding engagement with said CHARLES C. TOMKINSON. shoulder whereby the movement of the nut In witness whereof, I have hereunto set is retarded and further expansion is immy hand this 13th day of April, 1922. parted t0 the shield. I ARTHUR R. VAN TASSELL. 

